package day4;



class Root
{
    static {
        System.out.println("Root的静态初始化块");
    }
    {
        System.out.println("Root的普通初始化块");
    }
    public Root()
    {
        System.out.println("Root的无参数的构造器");
    }
}
class Mid extends Root
{
    static {
        System.out.println("Mid的静态初始化块");
    }
    {
        System.out.println("Mid的普通初始化块");
    }
    public Mid()
    {
        System.out.println("Mid的无参数的构造器");
    }
    public Mid(String msg)
    {
        // 通过this调用同一类中的重载的构造器
        this();
        System.out.println("Mid的带参数构造器,其参数值: " + msg);
    }
}
class Leaf extends Mid
{
    static {
        System.out.println("Leaf的静态初始化块");
    }
    {
        System.out.println("Leaf的普通初始化块");
    }
    public Leaf()
    {
        // 通过super调用父类中有一个字符串参数的构造器
        super("疯狂Java讲义");
        System.out.println("执行Leaf的构造器");
    }
}
public class Demo3
{
    public static void main(String[] args) {
        new Leaf();
//        new Leaf();
    }
}

